Deck 10: Fired Heaters Furnaces

Question 1

The flow of air through a furnace is referred to as:

A) suction
B) draft
C) air velocity
D) O₂ %

Answer 1

D

Question 2

The amount of combustibles in the flue gas:

A) O₂ %
B) percent combustibles
C) flue gas range
D) flue gas concentration

Answer 2

B

Question 3

Furnaces are classified as:

A) balanced draft
B) indirect and direct
C) forced draft
D) induced draft

Answer 3

indirect and direct

Question 4

When a burner flame goes out during operation it is referred to as:

A) flame out
B) burn out
C) fire out
D) flash back

Question 5

Air can enter the furnace through:

Question 6

Carbon deposits are most likely to be found in the:

A) convection section terminal penetrations
B) pre-heat tube
C) radiant tube
D) convection tube

Question 7

The term applied to gas vapors when they ignite and return back to the source:

A) flashback
B) auto ignition
C) back draft
D) ignition point

Question 8

List four fired heater " furnace" designs:

Question 9

Ensuring proper air concentration is critical because:

A) fuel burns cleaner and hotter if air mixture is correct
B) fuel burns cleaner and hotter if air mixture is incorrect
C) fuel burns poorly and cooler if air mixture is incorrect
D) a & c
E) b & c

Question 10

Tubes located above the shock bank:

A) conduction tubes
B) radiant tubes
C) convection tubes
D) bridgewall tubes

Question 11

Name four common furnace problems and describe each.

Question 12

Draw a cylinder furnace with balanced draft. Identify the components.

Question 13

Heat transfer occurs best under what three conditions:

Question 14

Complete CH_{4 +} 2O₂ combustion produces _____ and _______ .

Question 15

Methane as a fuel has a fuel heat value of:

A) 274 Btu/Cu.ft
B) 374 Btu/Cu.ft
C) 574 Btu/Cu.ft
D) 909 Btu/Cu.ft

Question 16

Draw a cabin furnace with radiant wall burners and induced draft. Show all components.

Question 17

Draw a natural draft, box furnace. Show all components.

Question 18

Convective heat transfer accounts for:

A) 30% to 40%
B) 40% to 50%
C) 60% to 70%
D) 70% to 80%

Question 19

An air preheater is a:

A) Cost saving system used to heat the air before it enters the burner
B) Device located at the burner tip
C) Narrow neck between the convection section and stack
D) Type of furnace that heats air before it mixes with fuel at burner

Question 20

A stationary or movable device used to remove unburned hydrocarbons from the upper section of the furnace:

A) radiant nozzle
B) convection blower
C) air register
D) soot blower

Question 21

When a furnace tube or section of refractory gets too hot:

A) flame impingement
B) scorching
C) hot spot
D) shock bank

Question 22

The air registers are located on the:

A) burner
B) fuel line
C) steam line
D) peep block

Question 23

Carbon deposits found inside furnace tubes:

A) carbonization
B) fouling
C) coking
D) mineral deposits

Question 24

The refractory lining on a furnace is composed of all of the following except:

A) insulation fire brick
B) stainless steel rod
C) kick-out panels
D) insulative bats
E) gunite
F) concrete
G) lead rods
H) peep block

Question 25

The section of the furnace that reaches the highest temperature is the:

A) convection section
B) radiant section
C) shock bank
D) firebox

Question 26

Most fired furnaces use:

A) natural gas
B) kerosene
C) fuel oil
D) a & c

Question 27

Hydrogen as a fuel has a fuel heat value of:

A) 274 Btu/Cu.ft
B) 374 Btu/Cu.ft
C) 574 Btu/Cu.ft
D) 909 Btu/Cu.ft

Question 28

Temperatures in a furnace range between:

A) 1000F to 1350F
B) 400F to 900F
C) 2000F to 2600F
D) 1600F to 2000F

Question 29

The stack damper in a furnace is set to give from:

A) 0.05 to 0.15 inches of water
B) 0.15 to 0.25 inches of water
C) 0.25 to 0.35 inches of mercury
D) 0.35 to 0.45 inches of water

Question 30

Direct fired furnaces heat process streams like heavy hydrocarbons, glycol, water, and molten salts.

Question 31

Radiant heat transfer accounts for:

A) 30% to 40%
B) 40% to 50%
C) 60% to 70%
D) 70% to 80%

Question 32

Gas flow out of a furnace is typically set at:

A) 150,000 pounds per hour
B) 250,000 pounds per hour
C) 350,000 pounds per hour
D) 450,000 pounds per hour

Question 33

Four draft types utilized on furnace designs are:

Question 34

Label the following furnace.